<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" @click="changeAllCheckbox" :checked='Allture'/>
    </label>
    <span>
      <span>已完成{{ (todoList.reduce((p, c)=>{return c.done ? p + 1 : p},0)) }}</span> /
      全部{{ todoList.length }}
    </span>
    <button class="btn btn-danger" @click='clearAll'>清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name: "Footer",
  props: ["todoList",'checkboxAllChange','clearAll'],
  methods:{
    //点击切换多个多选框逻辑
    changeAllCheckbox(e){
      this.checkboxAllChange(e.target.checked)
    }
  },
  computed:{
    Allture(){
      return  this.todoList.every(item=>item.done)&&this.todoList.length !== 0
    }
  }
};
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>